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Family name Найн (Nain , Nayn , Najn ) , in all the world, is a common last name. The surname Найн is characteristic of Brunei, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Cameroon. Measured by absolute frequency, the name is most common in India, Indonesia, and Myanmar. Likewise, Найн is the forename as well as the last name.